From: Witkrans
This Prisoner of War record for Christoffel Jacobus Van Graan was transcribed record from various documents held at the National Archives, South Africa, including arrest and shipping information from newspaper sources like De Zuid-Afrikaan.
https://www.gendatabase.com/boer-war-prisoner-record.php?q=19602&r=Christoffel Jacobus&s=Van Graan&ref=
This set of Prisoner of War documents can be accessed online via the FamilySearch.org project by Clicking Here.